Implement first end-to-end scraper with openfreemap data

[benoit74]

• implement full e2e logic in the scraper to create a functional ZIM in terms of data (everything needed is there)
• UI is definitely not yet correct, but this will follow

With this PR, it is possible to create a first functional ZIM of monaco area, proving the approach works well.

Note that for monaco area the ZIM size is a bit bigger than sum of tar.gz archives used to build it. Not a big surprise.

Downloaded data:

-rw-rw-r-- 1 benoit benoit 496K Feb 11 13:53 monaco.mbtiles
-rw-rw-r-- 1 benoit benoit 313M Feb 11 14:46 natural_earth.tar.gz
-rw-rw-r-- 1 benoit benoit  59M Feb 11 14:46 ofm.tar.gz
-rw-rw-r-- 1 benoit benoit 166K Feb 11 15:06 sprites.tar.gz
-rw-rw-r-- 1 benoit benoit  12K Feb 11 15:06 styles.tar.gz

ZIM:

-rw-r--r-- 1 benoit benoit 421M Feb 11 15:34 tests_maps_all_2026-02.zim

[codecov]

Codecov Report

❌ Patch coverage is 9.24658% with 265 lines in your changes missing coverage. Please review.
✅ Project coverage is 23.68%. Comparing base (6d3d0d2) to head (3abf5d7).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
scraper/src/maps2zim/processor.py	9.05%	261 Missing ⚠️
scraper/src/maps2zim/entrypoint.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #17       +/-   ##
===========================================
- Coverage   38.84%   23.68%   -15.17%     
===========================================
  Files          10       10               
  Lines         278      570      +292     
  Branches       16       61       +45     
===========================================
+ Hits          108      135       +27     
- Misses        170      435      +265     

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